How to call a java class method from spring boot service layer

I have my Spring boot application from where I am trying to call a method from a java class in a different module outside of my application. I have the dependency added to my project pom for that external module. The external module is not Spring boot application. I have my code as below

@Service
public class MyServiceImpl {
	private MyInterface myInterface;
	
	public Response callMethod1() {
		Response response = new Response();
		response = myInterface.callMethod1();
		return response;
	}
}

Interface MyInterface and its implementation are part of the external module. Code is something like this.

public interface MyInterface {
	Response callMethod1();
}

Implementation:

public class InterfaceImpl implements MyInterface {
	Response callMethod1() {
		Response response = doSomething();
		return response;
	}
}

When I call the service method, I see it failing with InvocationTargetException. I tried the debugger in eclipse and I won't see the break points in the Implementation getting hit. I tried by moving the code of Interface and Implementation into my project with some modifications to see if I can make it work. Here are my changes.

Service Class:

@Service
public class MyServiceImpl {
	@Autowired
	private MyInterface myInterface;
	
	public Response callMethod1() {
		Response response = new Response();
		response = myInterface.callMethod1();
		return response;
	}
}

Interface:

public interface MyInterface {
	Response callMethod1();
}

Implementation:

@Service
public class InterfaceImpl implements MyInterface {
	Response callMethod1() {
		Response response = doSomething();
		return response;
	}
}

How can I call the java class methods without changing the implementation and keeping it in its original module.

Thanks.

@Configuration
public class Config {
    
    @Bean
    public Foo createFoo() {
        Foo foo = new Foo();    // this is POJO
        return foo; // after return it will be saved in Spring Context and become a Bean 
    } 

}